0_0_37542026_23564.cpp: In function 'void dfs(int)':
0_0_37542026_23564.cpp:29:12: error: '_nnum' was not declared in this scope
if(nu==_nnum+1)
^
0_0_37542026_23564.cpp: In function 'int main()':
0_0_37542026_23564.cpp:80:21: error: '_nnum' was not declared in this scope
_nnum++;
^
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